Parallelize for performance, relationship resolver improvements #1334

Job	Run time
build_NetCore (Debug_NetCore)	1m 32s
build (6.8, Debug)	1m 31s
build_NetCore (Release_NetCore)	57s
build (6.8, Release)	2m 27s
build (6.10, Debug)	1m 28s
build (6.10, Release)	1m 46s
build (6.12, Debug)	1m 42s
build (6.12, Release)	1m 29s
build (latest, Debug)	1m 32s
build (latest, Release)	2m 24s
	16m 48s

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